irv6744

i have a new key that works in the door and turns in the ignition but i can't get the programming to work. does anyone know if the programming for a 2003 es300 is different than for a 2002. i have tried every programming i could find but none of them work. i have tried to add a key and i have tried to immobilise the keys so that only the one i have works so i can add keys. nothing is working. thanks